Question

A sound wave propagating in air may be treated either as a displacement wave or a pressure wave.What is the phase difference between the displacement and pressure wave :

• A. ${180}^{\circ }$
• B. ${90}^{\circ }$
• C. ${45}^{\circ }$
• D. zero

Answer 1

The correct option is B ${90}^{\circ }$

Displacement and pressure are 90 degree out of phase for mechanical waves. option "B" is correct.